Soda siphon



Nov. 2, 1937. D. c. STE-WART SODA SIPHON Filed July 20, 1936 PatentedNov. 2, 1937 UNITED STATES PATENT OFFICE SODA SIPHON Daniel 0. Stewart,Astoria, Long Island, N. Y. Application July 20, 1936, Serial No. 91,592

5 Claims.

This invention relates to soda water siphons and, among other objects,aims to provide a greatly improved, compact, easily refillable and lightweight metal siphon for carbonated water 5 having an air chamber toprevent over-filling and resultant explosions of the container.

Other aims and advantages of the invention will appear in thespecification, when considered in connection with the accompanyingdrawing,

whereinz Fig. 1 is a central sectional view'of a metal siphon embodyingthe invention; and

Fig. 2 is asectional 'view taken on the line 2-2 of Fig; 1. v

Practically all soda water siphons now on themarket employ heavy glassbottles, the weight of the quart size being six pounds or more. Theglasshas to be of sufficient thickness to withstand the tremendouspressures created in the bottles when the water is charged with carbondioxide under high pressures. Some of the glass bottles are reinforcedby woven strands of piano wire or the like to prevent accidents, due toexplosions. Such glass bottles are naturally subject to breakage andhave caused many serious accidents. If they are accidentally orcarelessly over-filled with Water, the resulting pressure will beexcessive and exceedingly dangerous. Moreover, the glass acts as a heatinsulator and prevents rapid cooling of the charged water. Thisinvention, therefore, provides a compact metallic bottle made of thinsheet metal capable of withstanding enormous pressures and havingprovision to prevent over-filling as well as the creation of excessivepressures which would cause explosions. Also, it provides a quart sizecontainer weighing only a fraction of the weight of the usual glassbottles. Further, the idea is to enhance the appearance of such bottlesand to provide a container which can be opened and easily cleaned byremoving the siphon head and tube.

Referring particularly to the drawing, showing one practical embodimentof the invention, the siphon container therein illustrated is composedof a non-corroding metal, such'as Monel metal or stainless steel and ismade in sections which are stamped out or otherwise formed and weldedtogether. In this instance, the container is shown as being generallycylindrical. It has a sheet metal base portion l secured to the roundedbottom portion of a lower container section II. These two parts arepreferably formed and welded, brazed or otherwise secured together and,afterwards, secured to an upper container section [2. The upper sectionI2 is shown as having an internal metal vase l3 conveniently. brazed orwelded to the lower edge thereof and spaced from the inside walls toprovide an annular air chamber l4 between the vase and the outside Wall.The lower portion of the vase has one or more openings l5 and the lowerend of the section I2 is adapted to be telescoped within the upper endof the section E! and the two sections welded or brazed together asshown. The upper ends of the section l2 and the vase l3 present anopening for a metal screw threaded filling neck or plug Eli shown asbeing secured therein by means of a nut I! within the vase screwed on anipple extension l8 of the neck and securely clamping the upper end ofthe vase to the top of the section I2. When the parts are thus secured,the entire bottom section I i and the vase portion l3 constitute .thewater compartment; while the chamber l4 provides an air pocket orchamber to prevent overfilling.

As is usual, the container is provided with an ordinary siphon tube 59which carries a gasket 20 at its upper end engaging the mouth of theneck or plug l6 and adapted to be clamped thereon by a screw threaded,valved head 2! of the usual type. The head has provision for theinsertion of the usual gas cartridge 22 in a holder 23, the arrangementbeing such that the cartridge is punctured by screwing the holder on anipple 25 so that the gas will be discharged through the head and thesiphon tube 59 into the container. Incidentally, the volume of the airchamber is shown as being about one-fourth of that of the water chamberor compartment. The CO2 cartridges or tubes contain about 8 /2 grams ofgas at 1000 pounds pressure. When discharged into a container holding aquart of water with an air chamber of 8 ounces water displacement, thepressure in the filled container will be reduced to between 35 and 50pounds, depending upon the amount of absorption of the gas by the waterwhen the charge is completed and the contents well shaken.

In Fig. 1, the container has been filled with water by removing andreplacing the head 2| and tube l9 and is about to be charged with gasfrom the cartridge 22. The water rises only slightly in the air chamberi l due to the static head. above the opening l5. As the gas enters, thecontainer is shaken to hasten the gas absorption by the water and tocause the remaining free gas to enter the opening it and mix with thetrapped air in the chamber l4. As the CO2 is admitted it creates a gaspressure causing some of the water to enter the compression chambercompressing thetrapped air in [4 which acts as a buffer. The volumes aresuch that the final compression pressure of the mixed air and gas insaid chamber cannot exceed approximately 50 pounds per square inch andpreferably ranges between about and pounds, depending upon the amount ofabsorption of the gas by the water. This pressure is sufiicient todischarge the entire contents from the container and will never cause anexplosion which would occur due to accidental or careless overfilling ofan ordinary bottle.

While the air chamber or trap may be produced in various ways, theillustrative example embodies probably the easiest and simplest form tomanufacture. Furthermore, the shape of the container is such that it maybe made of diestamped sheet metal sections. Since the chamber positivelyprevents overfilling the container and insures safe pressures, the sheetmetal may be very thin. Hence, the weight is greatly reduced and thecontainers are much easier to handle.

Obviously, the present invention is not .restricted to the particularembodiment thereof herein shown and described. Moreover, it is notindispensable that all the features of the invention be used conjointly,since they may be employed advantageously in various combinations andsub-combinations.

What is claimed is: i

1. A siphon container for charged water comprising a bottle composed ofsheet metal sections secured together; an annular vase secured in theupper part of the bottle having an opening at its lower end portionleading into the water compartment and providing an air chamber; and ascrew threaded metal neck on the bottle removably to receive a siphonhead.

2. A siphon container for charged Water comprising, in combination, ametal bottle; a neck secured to the mouth of the bottle; a tubularmember within the bottle projecting downwardly therein from the mouthand providing an air chamber in the upper portion of the bottle andcommunicating with the bottle near its lower end; and a siphon headhaving a combined filling and dispensing tube projecting through theneck into the bottom portion of the bottle.

3. A siphoncontainer for charged water comprising, in combination, asheet metal bottle; a neck removably secured to the mouth of the bottle;a tubular partition within the bottle secured. at its upper end to saidneck and providing an annular air chamber in the upper portion of thebottle and communicating at its lower end portion with the interior ofthe bottle; and a siphon head having a filling and dispensing tubeprojecting through the neck into the bottom portion of the bottle.

4. A siphon container for charged water comprising, in combination, ametal bottle; an annular vase secured in the upper part of the bottlehaving an opening near its lower end portion communicating with thewater compartment and providing an air chamber; and a neck secured inthe mouth of the bottle and having means clamping said vase to thebottle wall around the mouth.

5. A siphon container for charged water comprising, in combination, asubstantially cylindrical sheet metal bottle composed of sections; asheet metal vase axially arranged within the upper portion of the bottleand secured to the inner wall thereof near a joint between two of saidsections providing an air chamber communicating at its lower end withthe Water compartment of the bottle; and a neck removably secured to themouth of the bottle.

DANIEL C. STEWART.

